His singing partner, 23, jokes: “He’s trying to look like his older brother. He’s looking up to me!”

Adam certainly looks better for the weight loss. He’s slimmed from 16st 8lb to 12st 8lb and his nearly 40in waist is now down to just 30ins.

Ken McKay/ITV

Talent: Richard and Adam on Britain's Got Talent

He says: “I feel great. I’m trying to build muscle up now but I get scared because every time I eat I think I’m going to get bigger again.”

The duo have legions of female admirers.

So much so that every time their parents visit they bring sackloads of fan mail sent to the family home.

And Adam’s weight loss means he gets more of the attention now.

“He pulls in the women more than me. He’s a bit more of an icon to the fans,” says Richard with a smile.

Although their core fan base is young girls, they do have some older admirers. And some try to get closer than they’d like.

“Our fans are mainly young girls really. We get the odd one of a similar age to us,” says Richard, thinking for a moment before he adds: “And then you get the women aged 40 to 50, and then the odd nan who’s 80 to 90.

“You get the odd few that’ve come up to us at signings to say thanks, and then you go to get a kiss on the cheek and they go for the lips. You’ve just got to smile and move your head to the side.

"You’ve got to be aware at all times!”

Adam adds: “A few times we’ve felt a hand on our bum.

"They get really excited at signings and you’ve just got to say, ‘Easy...’ ”

The brothers are still with their girlfriends, who they insist don’t get jealous of all the admirers.